9 replies to this topic

[Lund]

Hi all,

I am currently pondering over the idea of using a duplex timing chain on my, to be, overbore 1275 MG engine. The engine currently has a single timing chain which seems to be in good order & could be used again.

Is it worth replacing the current timing gear with a duplex chain? I understand the benefits of a more accurately timed cam and quieter engine noise. However, I have noticed a few different types of duplex chain. Some Lightened and others not etc - is it more of a marketing scam than actual genuine benefits?

The Engine will be 1293 / 1310 / 1330 depending on the bore condition, and will be used daily with an MG special cam

The prices range from circa £15 to £130

( I have used the minisport website for ease of comparison)


Duplex Timing Gear & Chain Set £19.81 inc VAT



http://www.minisport...C-AJJ3323T.html

Lightened Duplex Timing Gear & Chain Set £27.06 inc VAT



http://www.minisport..._C-AJJ3324.html

Then there is a huge step up in price;

Lightened Vernier Duplex Timing Gear & Chain Set £79.96 inc VAT



http://www.minisport..._C-AJJ3327.html

Piper Duplex Vernier £133.43 inc VAT



http://www.minisport...PIPPULSMIN.html


I intend on spending my money optomising what I currently have.
* Which is my money best spent for the gains?
* What are the benefits of a lightened timing chain?
* What has everybody else used?

Tom

[Phaeton]

I don't know about the lightened bit, but you are looking at two different products looking at Duplex kits & Vernier Duplex kits. To get the cam timing correct with a Duplex kit you will also need offset keys to get 'best fit', whereas the Vernier are built in & you can get exact, hence the greater price.

Alan...

[Lund]

I don't know about the lightened bit, but you are looking at two different products looking at Duplex kits & Vernier Duplex kits. To get the cam timing correct with a Duplex kit you will also need offset keys to get 'best fit', whereas the Vernier are built in & you can get exact, hence the greater price.

Alan...

Ahh, thats where I was going wrong! Does it work out cheaper to use the Duplex kit with an offset key for the same benefits as vernier?

[Pooky]

With Vernier you should be able to get "perfect" cam timing. I think the best you could hope for with offset keys is within 1-2 degrees which shoud be fine for a road car. I think Verniers are more suited to race engines/people looking to squeeze every drop of bhp out of their engine.

[Lund]

With Vernier you should be able to get "perfect" cam timing. I think the best you could hope for with offset keys is within 1-2 degrees which shoud be fine for a road car. I think Verniers are more suited to race engines/people looking to squeeze every drop of bhp out of their engine.

Yeah the 1 or 2 degree's isn't a huge loss on a road car, it might make the diference between 1 or 2bhp on a race engine, thanks for the info guys. Think I'll spend about £30 on a duplex and then get the offset keys to time it within a few deg's.

[Paul Wiginton]

Id say get the Swifty one

http://www.swiftune....g-gear-set.aspx

Easy to use, lightweight and fairly cheap

Paul

[Ethel]

A Vernier pulley adjusts in steps too. That Swifty one is sexy, but you could put the price difference to good use elsewhere.

[mike.]

You can get off set keys in 1 degree increments so they can't be that inaccurate can they?

[T.Harper]

For a road car, just get the £19 one. There's no point spending the extra tenner on something that will do exactly the same job. You won't notice it being any lighter on a road car. As already said, spend the money elsewhere

[Lund]

For a road car, just get the £19 one. There's no point spending the extra tenner on something that will do exactly the same job. You won't notice it being any lighter on a road car. As already said, spend the money elsewhere

Okay, sorted.

Thanks all.